Benchmarking tools for Keystone modifications.

Partially functional, rv8 tests should be fine.

You will need to have a complete build of the rv8 musl toolchain somewhere on your PATH!

You will also need to ensure your buildroot build has BASH as its default shell!

Then, KEYSTONE_DIR=PATH_TO_KEYSTONE_ROOT_DIR make, copy the entire staging/ directory into your keystone's build/overlay/root/, rebuild the keystone image, and run run_all_tests.sh.